What's New
* Sort tasks by date asc or desc
* Schedule task(s) on your calendar from the action bar menu
* Save list scroll position when showing another screen, restore it when redisplayed
* Show priorities A-Z (not just E)
* Migrate data to internal storage, no longer require external storage access
* Fix "failed to load folder list from Dropbox" bug
* Fix landscape view on a tablet when the list is empty
* When not logged in, redirect to login screen
* Fix NullPointerException when clearing filter